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Grindelia pusilla : ウィキペディア英語版 | Grindelia pusilla
''Grindelia pusilla'', the little gumweed, is a North American species of flowering plants in the daisy family. It is found only in the State of Texas in the south-central United States.〔(Biota of North America Program 2014 county distribution map )〕〔(Nesom, G.L. 1990. Studies in the systematics of Mexican and Texan ''Grindelia'' (Asteraceae: Astereae. Phytologia 68(4): 303–332 ) distribution map on page 307〕 ''Grindelia pusilla '' grows in open, dry sites, often disturbed. It is an annual herb up to tall. The plant usually produces numerous flower heads in flat-topped arrays. Each head has 13-27 ray flowers, surrounding a large number of tiny disc flowers.〔(Flora of North America, ''Grindelia pusilla'' (Steyermark) G. L. Nesom, 1992. )〕〔(Steyermark, Julian Alfred. 1934. Annals of the Missouri Botanical Garden 21(3): 467 )〕 ==References==
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